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GM LT1 Wiring and Pinouts

Page history last edited by Greg 14 years, 1 month ago

GM LT1 Wiring and Pinouts

__________________________________________________________________________________________________________________________

Factory GM LT1 Wiring Harness Modifications & Pinouts

 

I have documented all modifications, as well as included pinout schematics and info on the integration of the Porsche harness.
 
The wiring for the emissions components is easily left intact [if desired]. The PCM will need to be reprogrammed, and tuning programs are available
for download (TunerCats, Moates Flash and Burn, and TTS Datamaster, to name a few).
 

On the ’96-’97 OBDII, two of the four O2 sensors can be programmed out, as well as VATS (anti-theft). Emissions and VSS can also be removed.

 

This is a 5-wire hook-up at the 944 harness [ignition, battery (+), fuel pump relay, alternator, and starter]. The 944 tach, GM DLC, and fan relay are wired directly from the PCM plugs.

 

1995 - 1997 LT1 PCM PINOUTS / WIRING HARNESS MODIFICATIONS

  
 

NOTE: ALL PCM CONNECTIONS ARE SHOWN BELOW. CONNECTIONS THAT WILL BE CHANGED DURING THE PORSCHE 944 CONVERSION

  

ARE SHOWN IN BLACK. ALL REMAINING PCM PIN CONNECTIONS (SHOWN IN GRAY) WILL REMAIN UNCHANGED. REPROGRAMMING THE

  

LT1 PCM IS REQUIRED WHEN PERFORMING THE MODIFICATIONS SHOWN. IF EMISSIONS EQUIPMENT WILL BE USED, ITEMS IN BLUE REMAIN INTACT.

  
             

VOLTAGE LEGEND

        
         

(1) - LESS THAN .5V WHEN SYSTEM ENABLED

        

(2) - BATTERY VOLTAGE FOR FIRST TWO SECONDS WITH IGNITION "ON"

        

(3) - VARIES

        

(4) - VARIES WITH TEMPERATURE

        

(5) - BATTERY VOLTAGE WHEN IN GEAR

        

(6) - LESS THAN .5V WITH BRAKE PEDAL APPLIED

        

(7) - BATTERY VOLTAGE WITH A/C "ON"

        

(8) - VARIES WITH ALTITUDE

        

(*) - LESS THAN .5V

        
             
             


PLUG A / RED

    

 

  

PIN #

FUNCTION

WIRE COLOR

PROCEDURE

VOLTAGE

  

 

 

 

 

KEY ON

KEY OFF

  

1

CRANKSHAFT POSITION SENSOR

YELLOW

N/A

 

 

  

2

PCM GROUND

BLK. / WHT.

N/A

0*

0*

  

3

INJECTOR #1 CONTROL

BLK.

N/A

B+

B+

  

4

INJECTOR #4 CONTROL

LT. BLUE / BLK.

N/A

B+

B+

  

5

INJECTOR #6 CONTROL

YEL. / BLK.

N/A

B+

B+

  

6

INJECTOR #7 CONTROL

RED / BLK.

N/A

B+

B+

  

7

FUEL PUMP RELAY CONTROL

DK. GRN. / WHT.

TO FUEL PUMP RELAY

0(2)

B+

  

8

EMPTY

N/A

N/A

 

 

  

9

EGR VACUUM CONTROL SIGNAL SOLENOID CONTROL VALVE

GRY.

REMOVE

B+(1)

B+(1)

  

10

SECONDARY / HIGH SPEED COOLING FAN RELAY CONTROL

DK. BLUE

TO HIGH SPD. FAN RELAY

B+(1)

B+(1)

  

11

PRIMARY / LOW SPEED COOLING FAN RELAY CONTROL

DK. GRN.

TO LOW SPD. FAN RELAY

B+(1)

B+(1)

  

12

EBTCM TP SENSOR SIGNAL

TAN / BLK.

N/A

 

 

  

13

TACH OUTPUT

WHT.

TO TACH INPUT

0*

[3]

  

14

AIR PUMP RELAY CONTROL

BRN.

REMOVE

B+ (1)

B+ (1)

  

15

TRANS. MODE LAMP CONTROL

DK. BLUE

REMOVE

 

 

  

16

EMPTY

N/A

N/A

 

 

  

17

EMPTY

N/A

N/A

 

 

  

18

PCM GROUND

TAN / BLK.

N/A

0*

0*

  

19

INJECTOR #2 CONTROL

LT. GRN. / BLK.

N/A

B+

B+

  

20

INJECTOR #5 CONTROL

BLK. / WHT.

N/A

B+

B+

  

21

INJECTOR #3 CONTROL

PINK / BLK.

N/A

B+

B+

  

22

INJECTOR #8 CONTROL

BK. BLUE / WHT.

N/A

B+

B+

  

23

TRACTION CONTROL SYSTEM SPARK RETARD REQUEST

ORN. / BLK.

REMOVE

B+

B+

  

24

EMPTY

N/A

N/A

 

 

  

25

FUEL ENABLE SIGNAL / (VATS)

DK. BLUE

TO VATS MODULE

2.5

2.5

  

26

EMPTY

N/A

N/A

 

 

  

27

EMPTY

N/A

N/A

 

 

  

28

EMPTY

N/A

N/A

 

 

  

29

EMPTY

N/A

N/A

 

 

  

30

EMPTY

N/A

N/A

 

 

  

31

VSS GROUND

PPL.

(OPTIONAL)

0*

0*

  

32

VSS SIGNAL

YLW.

(OPTIONAL)

[3]

[3]

  


PLUG B / BLACK

          

 

 

 

 

 

 

  

PIN #

FUNCTION

WIRE COLOR

PROCEDURE

VOLTAGE

  

 

 

 

 

KEY ON

KEY OFF

  

1

A/C REQUEST SIGNAL

DK. GRN. / WHT.

N/A

0*(7)

0*(7)

  

2

LOW RESOLUTION SIGNAL (HO2)

RED / BLK.

N/A

0 OR 5

[3]

  

3

DISTRIBUTOR REFERENCE LOW SIGNAL

PINK / BLK.

N/A

0*

0*

  

4

EMPTY

N/A

N/A

 

 

  

5

IGNITION CONTROL

WHT.

N/A

0*

[3]

  

6

SENSOR GROUND

BLK.

N/A

0*

0*

  

7

TRANSMISSION 1-2 SHIFT SOLENOID

LT. GRN.

REMOVE

B+

0*

  

8

VSS OUTPUT

DK. GRN. / WHT.

(OPTIONAL)

6.5

7.5

  

9

EMPTY

N/A

N/A

 

 

  

10

EMPTY

N/A

N/A

 

 

  

11

EMPTY

N/A

N/A

 

 

  

12

TRANSMISSION 2-3 SHIFT SOLENOID

YEL. / BLK.

REMOVE

B+

0*

  

13

TRANSMISSION 3-2 CONTROL SOLENOID OR SKIP SHIFT SOL.

WHT. OR GRY.

REMOVE

B+

B+

  

14

DISTRBUTOR IGNITION FEED

RED

N/A

B+

B+

  

15

PCM BATTERY FEED

ORN.

TO BATTERY (+)

B+

B+

  

16

SENSOR GROUND

BLK.

N/A

0*

0*

  

17

EMPTY

N/A

N/A

 

 

  

18

EMPTY

N/A

N/A

 

 

  

19

MAF SENSOR SIGNAL

YELLOW

N/A

5

4.3 [3]

  

20

HIGH RESOLUTION SIGNAL (HO2)

PPL. / WHT.

N/A

5

2.6 [3]

  

 

 

OR LT. BLUE / BLK.

 

 

 

  

21

A/C CLUTCH STATUS

DK. GRN.

N/A

0* (7)

0* (7)

  

22

EMPTY

N/A

N/A

 

 

  

23

EVAP VACUUM SWITCH SIGNAL

PPL.

REMOVE

 

 

  

24

EMPTY

N/A

N/A

 

 

  

25

EMPTY

N/A

N/A

 

 

  

26

EMPTY

N/A

N/A

 

 

  

27

EMPTY

N/A

N/A

 

 

  

28

5 VOLT REFERENCE

GRY.

N/A

5

5

  

29

5 VOLT REFERENCE

GRY.

N/A

5

5

  

30

PCM IGNITION FEED

PINK

TO IGNITION (+)

B+

B+

  

31

PCM BATTERY FEED

ORN.

TO BATTERY (+)

B+

B+

  

32

EMPTY

N/A

 

 

 

  

 

PLUG C / GRAY / CLEAR

    

 

  

PIN #

FUNCTION

WIRE COLOR

PROCEDURE

VOLTAGE

  

 

 

 

 

KEY ON

KEY OFF

  

1

IAC COIL "A" HIGH

LT. BLUE / WHT.

N/A

[3]

[3]

  

2

IAC COIL "A" LOW

LT. BLUE / BLK.

N/A

[3]

[3]

  

3

BANK 2 (RIGHT REAR) HO2S #2 LOW

TAN

N/A

 

 

  

4

BANK 2 (RIGHT REAR) HO2S #2 HIGH

PPL.

N/A

 

 

  

5

IAC COIL "B" LOW

LT. GRN. / BLK.

N/A

[3]

[3]

  

6

IAC COIL "B" HIGH

LT. GRN. / BLK.

N/A

[3]

[3]

  

7

BANK 2 (RIGHT) HO2S LOW (FRONT)

TAN

N/A

0*

0*

  

8

BANK 2 (RIGHT) HO2S HIGH (FRONT)

PPL.

N/A

[3]

.1 TO .9 [3]

  

9

EMPTY

N/A

N/A

 

 

  

10

EMPTY

N/A

N/A

 

 

  

11

TRACTION CONTROL SYSTEM "ACTIVE" SIGNAL

LT. BLUE

REMOVE

B+

B+

  

12

EMPTY

N/A

N/A

 

 

  

13

PERFORMANCE MODE SWITCH SIGNAL

LT. BLUE

REMOVE

B+

B+

  

14

BRAKE SWITCH SIGNAL

LT. BLUE / BLK.

REMOVE

B+ (6)

B+ (6)

  

15

PNP (PARK NUETRAL POSITION) SIGNAL

ORN. / BLK.

*CONNECT TO GROUND

0* (5)

0* (5)

  

16

TRANSMISSION PRESSURE CONTROL SOLENOID HIGH

RED / BLK.

REMOVE

0*

6.4

  

17

BANK 1 (LEFT REAR) HO2S #2 LOW

TAN / WHT.

N/A

 

 

  

18

BANK 1 (LEFT REAR) HO2S #2 HIGH

PPL. / WHT.

N/A

 

 

  

19

BANK 1 (LEFT) HO2S LOW (FRONT)

TAN / WHT.

N/A

0*

0*

  

20

BANK 1 (LEFT) HO2S HIGH (FRONT)

PPL. / WHT.

N/A

[3]

.1 TO .9 [3]

  

21

IAT SENSOR SIGNAL

TAN

N/A

3.9 (4)

3.7 (4)

  

22

TP SENSOR SIGNAL

DK. BLUE

N/A

0.68

0.7

  

23

MAP SENSOR SIGNAL

LT. GRN.

N/A

4.7 (8)

1.1 (8)

  

24

EMPTY

N/A

N/A

 

 

  

25

ECT SENSOR SIGNAL

YELLOW

N/A

2.3 (4)

2.2 (4)

  

26

EMPTY

N/A

N/A

 

 

  

27

EMPTY

N/A

N/A

 

 

  

28

TRANSMISSION RANGE SIGNAL "A"

PNK.

REMOVE

 

 

  

29

TRANSMISSION RANGE SIGNAL "B"

DK. BLUE

REMOVE

 

 

  

30

TRANSMISSION RANGE SIGNAL "C"

RED

REMOVE

 

 

  

31

EMPTY

N/A

N/A

 

 

  

32

PCM GROUND

BLK. / WHT.

N/A

0*

0*

  


PLUG D / BLUE

    

 

  

PIN #

FUNCTION

WIRE COLOR

PROCEDURE

VOLTAGE

  

 

 

 

 

KEY ON

KEY OFF

  

1

PCM GROUND

TAN / WHT.

N/A

0*

0*

  

2

TRANSMISSION PRESSURE CONTROL SOLENOID LOW

LT. BLUE / WHT.

REMOVE

0*

1.3

  

3

PCM IGNITION FEED

PINK

TO IGNITION (+)

B+

B+

  

4

EMPTY

N/A

N/A

 

 

  

5

EMPTY

N/A

N/A

 

 

  

6

REVERSE INHIBIT SOLENOID CONTROL (MANUAL)

LT. GRN.

REMOVE

 

 

  

6

TRANSMISSION TCC PWM SOLENOID (AUTOMATIC)

BRN.

REMOVE

B+

B+

  

7

SERIAL DATA (CLASS 2) *SEE NOTE BELOW

PPL.

TO ADL CONNECTOR

 

 

  

8

A/C CLUTCH RELAY CONTROL

DK. GRN. / WHT.

N/A

B+ (1)

B+ (1)

  

9

MIL CONTROL (SES LIGHT)

BRN. / WHT.

TO SES LIGHT

0*

B+ (1)

  

10

EVAP CANISTER PURGE SOLENOID VALVE CONTROL

DK. GRN. / WHT.

REMOVE

B+ (1)

B+ (1)

  

11

TRANSMISSION TCC SOLENOID

TAN / BLK.

REMOVE

B+

0

  

12

A/C REFRIGERANT PRESSURE SENSOR SIGNAL

RED / BLK.

N/A

[3]

[3]

  

13

EMPTY

N/A

N/A

 

 

  

14

EMPTY

N/A

N/A

 

 

  

15

SKIP SHIFT LAMP CONTROL

WHT.

REMOVE

B+

B+

  

16

EMPTY

N/A

N/A

 

 

  

17

EMPTY

N/A

N/A

 

 

  

18

EMPTY

N/A

N/A

 

 

  

19

EMPTY

N/A

N/A

 

 

  

20

OUTPUT / FIELD SERVICE ENABLE

WHT. / BLK.

TO ADL CONNECTOR

5

5

  

21

EMPTY

N/A

N/A

 

 

  

22

KS (KNOCK SENSOR) SIGNAL

DK. BLUE

N/A

1.6

1.5

  

23

EMPTY

N/A

N/A

 

 

  

24

A/C EVAPORATOR TEMPERATURE SENSOR SIGNAL

DK. BLUE

N/A

1.4 (4)

1.4 (4)

  

25

EMPTY

N/A

N/A

 

 

  

26

EMPTY

N/A

N/A

 

 

  

27

EMPTY

N/A

N/A

 

 

  

28

TRANSMISSION FLUID TEMP. SENSOR SIGNAL

YEL. / BLK.

REMOVE

2.5 (4)

1.6 (4)

  

29

EMPTY

N/A

N/A

 

 

  

30

SERIAL DATA

TAN

TO ADL CONNECTOR

[3]

[3]

  

31

EMPTY

N/A

N/A

 

 

  

32

EMPTY

N/A

N/A

 

 

  
             

NOTE: 1996-97 OBDII SHOWN IN RED ABOVE

        

NOTE: ADL CONNECTOR ALSO REQUIRES BATTERY (+) POWER AND 2 GROUND CONNECTIONS (-)

      
             

1993-1997 F-body Wiring Replacement Pig Tails

 

  

AC-Delco Part #

Usage

GM Part #

 

  

PT114

Fuel Injector

12085491

 

  

PT121

oil pressure switch

12085499

 

  

PT123

1993-1997 MAP sensor

12085502

 

  

PT189

1993-2002 radiator cooling fan motor

12101917

 

  

PT209

1993-1997 A/C compressor

12101937

 

  

PT307

IAT 

12102620

 

  

PT368

1994-1997 front O2 sensor

12102741

 

  

PT375

1993-1997 TPS and a/c pressure sensor

12102748

 

  

PT494

1993-1997 Alternator

88987962 / 12117361

 

  

PT757

1993-1997 ICM 

12126487

 

  

PT919

1996-1997 rear O2 sensor

15305801

 

  

PT1795

1996-1997 ignition coil (single connector)

88987992

 

  

 

 

1995 Caprice [OBDII] Pinouts 1 & 2

___________________________________________________________________

[Same as OBDII Corvette]

 

 

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